feat: add example for truncate

[ctron]

I also upticked the dependency version and the rev in the patch section.

[trust-git-bot]

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[aDogCalledSpot]

Looks good to me, it might be worth adding a comment in the docs saying that the truncate doesn't necessarily truncate num grapheme clusters but rather rounds down to the next unicode codepoint after num bytes.

I'm not sure if adding any extra complexity to the code is worth it though. At best you could maybe trim off num unicode codepoints by using s.char_indices().rev().nth(num) which will still look weird in a lot of cases and anything better than that will require an extra dependency. So a comment would probably be good, just so people aren't surprised that there are only 5 characters visible when they wanted to keep 10.